Design of bipolar current source with amplitude up to 200 mA

Author

Qiu, Dongming

Author_Institution

Zhejiang Univ., Hangzhou, China

Volume

38

Issue

3

fYear

1989

fDate

6/1/1989 12:00:00 AM

Firstpage

769

Lastpage

772

Abstract

One of the major requirements on the performance of a current source used for existing sensors is its amplitude stability. A method for designing a bipolar current source with amplitude up to 200 mA is developed. Its operating frequency is 10 kHz. The application of automatic control principles to the design of such a source makes the required amplitude stability possible. The circuit and its test data, including the maximum output amplitude, internal impedance, output regulation, and adjustment characteristic for an actual source, are given. This current source has successfully been used to excite the sensor of a continuous casting slag detector

Keywords

bipolar transistor circuits; casting; constant current sources; eddy current testing; electric current control; electric sensing devices; power supplies to apparatus; stability; 10 kHz; 200 mA; adjustment characteristic; amplitude stability; automatic control; bipolar current source; continuous casting slag detector; eddy current detector; internal impedance; maximum output amplitude; output regulation; Circuit stability; Circuit testing; Eddy currents; Frequency; Impedance; Magnetic sensors; Operational amplifiers; Sensor phenomena and characterization; Slag; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.32190

Filename

32190